I agree with what was stated earlier, many are only aquainted with a tartan kilt and are not familiar with the modern styles of kilts that are out there now. This is one of those situations where you need to sit down and gently talk to her about it. It may take a little coaxing to get her to reveal the present turn around in her opinion. One thing to concider is did you get any admiring looks from other females when you were out with her with your tank on? That may be the problem. My wife was a little "over protective" when I first started wearing kilts when we would go out. I had to tell her that I wear my kilts because I like them and that she liked them. I got her in the mindset that the admiring glances I was getting was a way of showing her that they were jealious that I was with HER. Make her feel like she is the "big momma bear" as it were. Since then I have gotten her a tshirt that says" If you want to know what is under his kilt , ASK ME!" It really changed her attitude. Now she walks around with me like , Yes he is mine, back off!

Good luck, remember COMMUNICATE!!! Few really do these days!